Three walls of the astrological Shi Tian wall

Shi Tian Wall is the lower wall of Sanyuan, located in the southeast direction under Wei Zibi, occupying about 57 degrees in the sky, which is roughly equivalent to a part of the international cosmological constellations such as the Five Immortals, the Giant Snake and the Snake, including 19 star official (seat), 87 positive star and 173 additional star. It takes the throne as the center and becomes a screen fan. Shi Tian is a fair, and Tian Wenzhi, Book of Jin, said, "The son of heaven leads princes to prosper the city." Therefore, the names of stars are often used to name the market names of goods and instruments and commercial content. For example, Tian Wenzhi, Book of Jin, said: The emperor's seat stands for Yin and Yang, welcoming guests and bucket stands for quantity, welcoming guests is used to measure solids, and bucket is used to measure liquids. The list of "goods representing Baoyu" is Baoyu's exclusive market, and the garage is the "main cargo area".

At present, there is no conclusion about the creation time of ternary. According to ancient records, Zi Weiyuan and Tian Shiyuan, as star officials, first appeared in the book Kaiyuan Zhan Jing, which compiled the Star Classic of the Stone God, and the name of Tai Weiyuan first appeared in astronomical poems in the early Tang Dynasty. However, the official name of the star equivalent to ternary star has been included in the record of the historian "Official Book". The stars in the east and west of Tianshi Garden are all named after the country names of the Warring States Period, which is also a proof of the founding of Sanyuan.